Tuning-hammer.



H. E. HALE.

TUNING HAMMER.

APPLICATION FILED AUG. 13, 1914.

1,160,107. Patented Nov. 9, 1915.

HAROLD E. HALE, OF SOMERVILLE, MASSACHUSETTS, ASSIGNOE TO TUNERS SUPPLYCOMPANY, OF SOMERVILLE, MASSACHUSETTS, A GORPORATICN OF MASSACHUSETTS.

TUNING-HAMMER.

Application filed August 13,

To all who-m may concern:

Be it known that I, HAROLD E. HALE, a citizen of the United States, andresident of Somerville, county of Middlesex, Commonwealth ofMassachusetts, have invented an Improvement in Tuning-Hammers, of whichthe following description, in connection with the accompanying drawings,is a specification, like characters on the drawings representing likeparts in each of the several views This invention relates to appliancesfor tuning pianos and like instruments, of the type known as tuninghammers, these being more properly a form of wrench adapted to engageand turn the squared or angular ends f the piano pins. In this type ofappliance it is requisite to form the wrench head separate from thehandle shank, with an extension adapted to hold the socket piece eXtending out laterally in a somewhat oblique direction from the handle, and aconnection to the handle capable of holding the parts rigid and securein use and of such a nature as to withstand and transmit heavy torsionaland angular stresses and thrusts.

A prime object of the present invention is to form a tuning hammerwrench head with a connection to its handle shank that is exceptionallystrong and rigid, yet capable of being readily assembled and takenapart. To this end I provide a novel construction of cone and cupinterengagement between the handle shank and the wrench head cooperativewith a bolt and nut connection to hold the parts together but littleless rigidly and securely than as though they were integral.

The above and other objects and features of the invention will be betterunderstood from the following detailed description taken in connectionwith the accompanying drawings and will be thereafter pointed out in theappended claims.

Referring to the drawings: Figure 1 shows in perspective a tuning hammerconstructed in accordance with my invention, a part of the handle beingbroken away; 2 shows enlarged partly in elevation and partly inlengthwise section the interengaging parts of the wrench head and handleshank; and Fig. 3 is a view showing the same parts in elevation andseparated.

The handle of the tuning hammer is indicated at 10 with a handle shank11 that may Specification of Letters Patent.

Patented Nov. 9, 1&215.

191s. Serial No. 658,515.

be extensibly mounted as usual. The handle shank 11 has at its end a cupformation 12 and within the same a threaded nipple 13 which as shownextends a distance beyond the same. The inner walls of the cup 12 areconical as seen at 1% and are formed to fit a cone l5 projecting fromthe wrench head 16, this head having a threaded bore 17 tending throughthe cone 15 to near the back of the head and adapted to receive thethreaded nipple 13. A lateral extension 18 of the wrench head may haveremovably fitted thereto a socket piece 19 having in the end thereof asocket recess 20 adapted to the ends of the pins. I preferably formslots or saw-cuts 21 lengthwise of the cone 15 whereby some littledegree of resiliency is imparted thereto. Thus as the parts are assembled together, as the conical cup walls ll engage the cone 15, thecone will in the further setting up be sprung down on to the threads ofnipple 13 effecting a strong and secure locking of the parts together.

It will be noted that with my improved construction a very materialreinforcing is obtained at the joint between the wrench head and thehandle shank for the reason that when the parts are set up to operativelocked position there is a cross section of metal to resist breaLage ordistortion which includes the nipple 13, the cone 15 and also the crosssection through thecup 12, these several sections of metal actingvirtually as an integral mass when interengaged in operative position asseen in Fi 2. It is to be noted that this desirable resultfollowsessentially from the fact that the cup and cone are superposed upon thesame section of the connection that contains the threadedinterengagement of nipple 18 in its tapped bore 17; c. g., this resultof reinforcing and strengthening the joint would not follow in the sameway were a cone similar to the cone 15 formed at the back of the nipple18 to engage a cup on the wrench head back of nipple 13.

I am aware that the invention can be embodied in other specific forms asto details of construction without departing from the spirit oressential attributes thereof and I therefore desire the presentembodiment to be shown as illustrative and not restrictive, referringrather to the appended claims to indicate the scope of the invention.

Having described my invention, what I claim as new and desire to secureby Letfit the conical walls of said cup, said conicalcup co-acting withsaid cone formation to constitute a reinforce superposed on the threadedconnection of said nipple with said bore to resist bending and wrenchingstrains.

2. A tuning hammer, comprising a wrench head and a handle shank, saidhead having a cone formation projecting therefrom with a threaded boreextending through the cone toward the back of the head, and said handleshank having a threaded nipple at its end for engaging said bore with aconical cup surrounding said nipple and adapted to inter-fit with saidcone as the parts are assembled, said conical cup co-acting with saidcone formation to constitute a reinforce superposed on the threadedconnection of said nipple with said bore to resist bending and wrenchingstrains. i

a 3. Atuning hammer, comprisinga wrench head and a handle shank, one ofsaid members having a threaded 'bore with a cone extending therefromthrough which said bore extends, said cone being slotted lengthwise, andthe other member having a threaded nipple at its end with a conical cupsurrounding said nipple and adapted to interfit with said cone as theparts are assembled to spring the same and press it into frictionallocking engagement with said nipple, said conical cup co-acting withsaid cone to constitute a reinforce superposed on the threadedconnection, to strengthen the same and resist bending and wrenchingstrains.

Intestimony whereof, I have signed my name to this specification, in thepresence of two subscribing witnesses.

HAROLD E. HALE.

Witnesses GEORGE W. GARLAND, CLYDEVL. Roonns.

Gopies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

' Washington, 11.0.

